How many light-year in 1 astronomical units? The answer is 1.5812507409821E-5. We assume you are converting between light year and astronomical unit. You can view more details on each measurement unit: light-year or astronomical units The SI base unit for length is the metre. 1 metre is equal to 1.0570008340246E-16 light-year, or 6.6845871222684E-12 astronomical units. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between light years and astronomical units. Type in your own numbers in the form to convert the units!
1 light-year to astronomical units = 63241.07708 astronomical units
2 light-year to astronomical units = 126482.15417 astronomical units
3 light-year to astronomical units = 189723.23125 astronomical units
4 light-year to astronomical units = 252964.30834 astronomical units
5 light-year to astronomical units = 316205.38542 astronomical units
6 light-year to astronomical units = 379446.46251 astronomical units
7 light-year to astronomical units = 442687.53959 astronomical units
8 light-year to astronomical units = 505928.61667 astronomical units
9 light-year to astronomical units = 569169.69376 astronomical units
10 light-year to astronomical units = 632410.77084 astronomical units
You can do the reverse unit conversion from astronomical units to light-year, or enter any two units below:
A light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).
The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length defined to be exactly equal to 149,597,870,700 metres. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition.
The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".
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